Re: [Linux-stable-mirror] [PATCH v4.4 backport 16/16] powerpc/64s: Allow control of RFI flush via debugfs

On Sun, Feb 04, 2018 at 04:00:10PM +1100, Michael Ellerman wrote:

commit 236003e6b5443c45c18e613d2b0d776a9f87540e upstream.

Expose the state of the RFI flush (enabled/disabled) via debugfs, and allow it to be enabled/disabled at runtime.

eg: $ cat /sys/kernel/debug/powerpc/rfi_flush 1 $ echo 0 > /sys/kernel/debug/powerpc/rfi_flush $ cat /sys/kernel/debug/powerpc/rfi_flush 0

Signed-off-by: Michael Ellerman mpe@ellerman.id.au Reviewed-by: Nicholas Piggin npiggin@gmail.com

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arch/powerpc/kernel/setup_64.c | 31 +++++++++++++++++++++++++++++++ 1 file changed, 31 insertions(+)

Also applied to 4.9.y and 4.14.y, thanks.

greg k-h